On Thu, Oct 19, 2023 at 02:40:30PM +0200, Nils Fuerste wrote: > Hello everyone! > > I am trying to use a NIC as a PTP GM with any external sync sorce. I have a > PC with a dual port NIC (82599ES 10-Gigabit SFI/SFP+) connected to an > embedded device over Ethernet. I use a SFP-to-Ethernet adapter to translate > from SFP+ to Ethernet. Both devices need to be synced but I cannot use GPS > or other external clock sources. My idea is to use the NIC as a PTP GM and > serve the embedded device with PTP. What I am not sure about is if I need to > use phc2sys to sync NIC and the physical clock of the machine hosting the > NIC? What quality of sync can I expect?
You can leave the clock of the NIC running free if you don't need the client's clock to be accurate, only synchronized to the server. > ptp4l[2023/10/19/12:28:10]: state=2 rms 222 max 518 freq +1020 +/- 0 > delay 20436 +/- 13 > ptp4l[2023/10/19/12:28:11]: state=2 rms 968245340 max 999999669 freq +992 > +/- 0 delay 20507 +/- 36 > ptp4l[2023/10/19/12:28:13]: state=2 rms 433012546 max 999999740 freq +921 > +/- 28 delay 20559 +/- 31 Those errors are almost exactly 1 second, which is very suspicious. It could be a driver bug. What kernel version do you use? It would help if you could get a third device and see if it works better as a server or client to determine on which side is the problem. -- Miroslav Lichvar _______________________________________________ Linuxptp-users mailing list Linuxptp-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/linuxptp-users
